Some will argue otherwise, however I have (in theory, lol) put Omna amps in the freezer for 40 minutes or so, the test crashed and was clearly evident, all it took to return the amp to normal was rub it between my hands for 10 minutes or so. It should turn milky white or crystallized looking...however this has been my experience, and others may have other experiences. If all looks right, packaging, amps, etc., it is likely real, if still in doubt it does not hurt to freeze it for 40 to 60 minutes.